<?php
/**
 * ---------------------------------------------------------------------
 * GLPI - Gestionnaire Libre de Parc Informatique
 * Copyright (C) 2015-2018 Teclib' and contributors.
 *
 * http://glpi-project.org
 *
 * based on GLPI - Gestionnaire Libre de Parc Informatique
 * Copyright (C) 2003-2014 by the INDEPNET Development Team.
 *
 * ---------------------------------------------------------------------
 *
 * LICENSE
 *
 * This file is part of GLPI.
 *
 * GLPI is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * GLPI is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GLPI. If not, see <http://www.gnu.org/licenses/>.
 * ---------------------------------------------------------------------
 */

if (!defined('GLPI_ROOT')) {
   die("Sorry. You can't access this file directly");
}

/**
 * NotificationTemplate Class
**/
class NotificationTemplate extends CommonDBTM {

   // From CommonDBTM
   public $dohistory = true;

   //Signature to add to the template
   public $signature = '';

   //Store templates for each language
   public $templates_by_languages = [];

   static $rightname = 'config';



   static function getTypeName($nb = 0) {
      return _n('Notification template', 'Notification templates', $nb);
   }


   static function canCreate() {
      return static::canUpdate();
   }


   /**
    * @since 0.85
   **/
   static function canPurge() {
      return static::canUpdate();
   }


   function defineTabs($options = []) {

      $ong = [];
      $this->addDefaultFormTab($ong);
      $this->addStandardTab('NotificationTemplateTranslation', $ong, $options);
      $this->addStandardTab('Notification_NotificationTemplate', $ong, $options);
      $this->addStandardTab('Log', $ong, $options);

      return $ong;
   }


   /**
    * Reset already computed templates
   **/
   function resetComputedTemplates() {
      $this->templates_by_languages = [];
   }


   function showForm($ID, $options = []) {
      global $CFG_GLPI;

      if (!Config::canUpdate()) {
         return false;
      }

      $spotted = false;

      if (empty($ID)) {
         if ($this->getEmpty()) {
            $spotted = true;
         }

      } else {
         if ($this->getFromDB($ID)) {
            $spotted = true;
         }
      }

      $this->showFormHeader($options);

      echo "<tr class='tab_bg_1'><td>" . __('Name') . "</td>";
      echo "<td colspan='3'>";
      Html::autocompletionTextField($this, "name");
      echo "</td></tr>";

      echo "<tr class='tab_bg_1'><td>" . __('Type') . "</td><td colspan='3'>";
      Dropdown::showItemTypes('itemtype', $CFG_GLPI["notificationtemplates_types"],
                              ['value' => ($this->fields['itemtype']
                                                ?$this->fields['itemtype'] :'Ticket')]);
      echo "</td></tr>";

      echo "<tr class='tab_bg_1'><td>".__('Comments')."</td>";
      echo "<td colspan='3'>";
      echo "<textarea cols='60' rows='5' name='comment' >".$this->fields["comment"]."</textarea>";
      echo "</td></tr>";

      echo "<tr class='tab_bg_1'><td>".__('CSS')."</td>";
      echo "<td colspan='3'>";
      echo "<textarea cols='60' rows='5' name='css' >".$this->fields["css"]."</textarea></td></tr>";

      $this->showFormButtons($options);
      return true;
   }


   function rawSearchOptions() {
      $tab = [];

      $tab[] = [
         'id'                 => 'common',
         'name'               => __('Characteristics')
      ];

      $tab[] = [
         'id'                 => '1',
         'table'              => $this->getTable(),
         'field'              => 'name',
         'name'               => __('Name'),
         'datatype'           => 'itemlink',
         'massiveaction'      => false
      ];

      $tab[] = [
         'id'                 => '4',
         'table'              => $this->getTable(),
         'field'              => 'itemtype',
         'name'               => __('Type'),
         'datatype'           => 'itemtypename',
         'itemtype_list'      => 'notificationtemplates_types',
         'massiveaction'      => false
      ];

      $tab[] = [
         'id'                 => '16',
         'table'              => $this->getTable(),
         'field'              => 'comment',
         'name'               => __('Comments'),
         'datatype'           => 'text'
      ];

      return $tab;
   }


   /**
    * Display templates available for an itemtype
    *
    * @param $name      the dropdown name
    * @param $itemtype  display templates for this itemtype only
    * @param $value     the dropdown's default value (0 by default)
   **/
   static function dropdownTemplates($name, $itemtype, $value = 0) {
      global $DB;

      self::dropdown([
         'name'       => $name,
         'value'     => $value,
         'comment'   => 1,
         'condition' => ['itemtype' => $itemtype]
      ]);
   }


   /**
    * @param $options
   **/
   function getAdditionnalProcessOption($options) {

      //Additionnal option can be given for template processing
      //For the moment, only option to see private tasks & followups is available
      if (!empty($options)
          && isset($options['sendprivate'])) {
         return 1;
      }
      return 0;
   }


   /**
    * @param $target             NotificationTarget object
    * @param $user_infos   array
    * @param $event
    * @param $options      array
    *
    * @return id of the template in templates_by_languages / false if computation failed
   **/
   function getTemplateByLanguage(NotificationTarget $target, $user_infos = [],
                                  $event = '', $options = []) {

      $lang     = [];
      $language = $user_infos['language'];

      if (isset($user_infos['additionnaloption'])) {
         $additionnaloption =  $user_infos['additionnaloption'];
      } else {
         $additionnaloption =  [];
      }

      $tid  = $language;
      $tid .= serialize($additionnaloption);

      $tid  = sha1($tid);

      if (!isset($this->templates_by_languages[$tid])) {
         //Switch to the desired language
         $bak_dropdowntranslations = (isset($_SESSION['glpi_dropdowntranslations']) ? $_SESSION['glpi_dropdowntranslations'] : null);
         $_SESSION['glpi_dropdowntranslations'] = DropdownTranslation::getAvailableTranslations($language);
         Session::loadLanguage($language);
         $bak_language = $_SESSION["glpilanguage"];
         $_SESSION["glpilanguage"] = $language;

         //If event is raised by a plugin, load it in order to get the language file available
         if ($plug = isPluginItemType(get_class($target->obj))) {
            Plugin::loadLang(strtolower($plug['plugin']), $language);
         }

         //Get template's language data for in this language
         $options['additionnaloption'] = $additionnaloption;
         $data = &$target->getForTemplate($event, $options);

         $footer_string = Html::entity_decode_deep(__('Automatically generated by GLPI'));

         $add_header                = Html::entity_decode_deep($target->getContentHeader());
         $add_footer                = Html::entity_decode_deep($target->getContentFooter());

         //Restore default language
         $_SESSION["glpilanguage"] = $bak_language;
         Session::loadLanguage();
         if ($bak_dropdowntranslations !== null) {
            $_SESSION['glpi_dropdowntranslations'] = $bak_dropdowntranslations;
         } else {
            unset($_SESSION['glpi_dropdowntranslations']);
         }
         if ($plug = isPluginItemType(get_class($target->obj))) {
            Plugin::loadLang(strtolower($plug['plugin']));
         }

         if ($template_datas = $this->getByLanguage($language)) {
            //Template processing

            // Decode html chars to have clean text
            $template_datas['content_text']
                                       = Html::entity_decode_deep($template_datas['content_text']);
            $data                      = Html::entity_decode_deep($data);

            $template_datas['subject'] = Html::entity_decode_deep($template_datas['subject']);
            $this->signature           = Html::entity_decode_deep($this->signature);

            $lang['subject']           = $target->getSubjectPrefix($event) .
                                          self::process($template_datas['subject'], $data);
            $lang['content_html']      = '';

            //If no html content, then send only in text
            if (!empty($template_datas['content_html'])) {
               $signature_html = Html::entities_deep($this->signature);
               $signature_html = Html::nl2br_deep($signature_html);

               $template_datas['content_html'] = self::process(
                  $template_datas['content_html'],
                  self::getDataForHtml($target, $data)
               );

               $lang['content_html'] =
                     "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\"
                        'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>".
                     "<html>
                        <head>
                         <META http-equiv='Content-Type' content='text/html; charset=utf-8'>
                         <title>".Html::entities_deep($lang['subject'])."</title>
                         <style type='text/css'>
                           ".$this->fields['css']."
                         </style>
                        </head>
                        <body>\n".(!empty($add_header)?$add_header."\n<br><br>":'').
                        $template_datas['content_html'].
                     "<br><br>-- \n<br>".$signature_html.
                     "<br>$footer_string".
                     "<br><br>\n".(!empty($add_footer)?$add_footer."\n<br><br>":'').
                     "\n</body></html>";
            }

            $lang['content_text']
                  = (!empty($add_header)?$add_header."\n\n":'').                    Html::clean(self::process($template_datas['content_text'],
                                $data)."\n\n-- \n".$this->signature.
                                      "\n".Html::entity_decode_deep(__('Automatically generated by GLPI')))."\n\n".$add_footer;
            $this->templates_by_languages[$tid] = $lang;
         }
      }
      if (isset($this->templates_by_languages[$tid])) {
         return $tid;
      }
      return false;
   }


   /**
    * @param $string
    * @param $data
   **/
   static function process($string, $data) {

      $offset = $new_offset = 0;
      //Template processed
      $output = "";

      $cleandata = [];
      // clean data for strtr
      foreach ($data as $field => $value) {
         if (!is_array($value)) {
            $cleandata[$field] = $value;
         }
      }

      //Remove all
      $string = Toolbox::unclean_cross_side_scripting_deep($string);

      //First of all process the FOREACH tag
      if (preg_match_all("/##FOREACH[ ]?(FIRST|LAST)?[ ]?([0-9]*)?[ ]?([a-zA-Z-0-9\.]*)##/i",
                         $string, $out)) {

         foreach ($out[3] as $id => $tag_infos) {
            $regex = "/".$out[0][$id]."(.*)##ENDFOREACH".$tag_infos."##/Uis";

            if (preg_match($regex, $string, $tag_out)
                && isset($data[$tag_infos])
                && is_array($data[$tag_infos])) {

               $data_lang_foreach = $cleandata;
               unset($data_lang_foreach[$tag_infos]);

               //Manage FIRST & LAST statement
               $foreachvalues = $data[$tag_infos];
               if (!empty($foreachvalues)) {
                  if (isset($out[1][$id]) && ($out[1][$id] != '')) {

                     if ($out[1][$id] == 'FIRST') {
                        $foreachvalues = array_reverse($foreachvalues);
                     }

                     if (isset($out[2][$id]) && $out[2][$id]) {
                        $foreachvalues = array_slice($foreachvalues, 0, $out[2][$id]);
                     } else {
                        $foreachvalues = array_slice($foreachvalues, 0, 1);
                     }
                  }
               }

               $output_foreach_string = "";
               foreach ($foreachvalues as $line) {
                  foreach ($line as $field => $value) {
                     if (!is_array($value)) {
                        $data_lang_foreach[$field] = $value;
                     }
                  }
                  $tmp                    = self::processIf($tag_out[1], $data_lang_foreach);
                  $output_foreach_string .= strtr($tmp, $data_lang_foreach);
               }
               $string = str_replace($tag_out[0], $output_foreach_string, $string);

            } else {
               $string = str_replace($tag_out, '', $string);
            }
         }
      }

      //Now process IF statements
      $string = self::processIf($string, $cleandata);
      $string = strtr($string, $cleandata);

      return $string;
   }


   /**
    * @param $string
    * @param $data
   **/
   static function processIf($string, $data) {

      if (preg_match_all("/##IF([a-z\.]*)[=]?(.*?)##/i", $string, $out)) {
         foreach ($out[1] as $key => $tag_infos) {
            $if_field = $tag_infos;
            //Get the field tag value (if one)
            $regex_if = "/##IF".$if_field."[=]?.*##(.*)##ENDIF".$if_field."##/Uis";
            //Get the else tag value (if one)
            $regex_else = "/##ELSE".$if_field."[=]?.*##(.*)##ENDELSE".$if_field."##/Uis";

            if (empty($out[2][$key]) && !strlen($out[2][$key])) { // No = : check if ot empty or not null

               if (isset($data['##'.$if_field.'##'])
                   && $data['##'.$if_field.'##'] != '0'
                   && $data['##'.$if_field.'##'] != ''
                   && $data['##'.$if_field.'##'] != '&nbsp;'
                   && !is_null($data['##'.$if_field.'##'])) {

                  $condition_ok = true;

               } else {
                  $condition_ok = false;
               }

            } else { // check exact match

               if (isset($data['##'.$if_field.'##'])
                   && (Html::entity_decode_deep($data['##'.$if_field.'##'])
                           == Html::entity_decode_deep($out[2][$key]))) {

                  $condition_ok = true;

               } else {
                  $condition_ok = false;
               }
            }

            // Force only one replacement to permit multiple use of the same condition
            if ($condition_ok) { // Do IF
               $string = preg_replace($regex_if, "\\1", $string, 1);
               $string = preg_replace($regex_else, "", $string, 1);

            } else { // Do ELSE
               $string = preg_replace($regex_if, "", $string, 1);
               $string = preg_replace($regex_else, "\\1", $string, 1);
            }
         }
      }
      return $string;
   }

   /**
    * Convert notification data to HTML format.
    *
    * @param NotificationTarget $target
    * @param array $data
    * @return array
    */
   private static function getDataForHtml(NotificationTarget $target, array $data) {
      $dataForHtml = [];

      foreach ($data as $tag => $value) {
         if (is_array($value)) {
            $dataForHtml[$tag] = self::getDataForHtml($target, $value);
         } else if (!in_array($tag, $target->html_tags)) {
            $dataForHtml[$tag] = Html::nl2br_deep(Html::entities_deep($value));
         } else {
            $dataForHtml[$tag] = $value;
         }
      }

      return $dataForHtml;
   }


   /**
    * @param $signature
   **/
   function setSignature($signature) {
      $this->signature = $signature;
   }


   /**
    * @param $language
   **/
   function getByLanguage($language) {
      global $DB;

      $iterator = $DB->request([
         'FROM'   => 'glpi_notificationtemplatetranslations',
         'WHERE'  => [
            'notificationtemplates_id' => $this->getField('id'),
            'language'                 => [$language, '']
         ],
         'ORDER'  => 'language DESC',
         'LIMIT'  => 1
      ]);
      if (count($iterator)) {
         return $iterator->next();
      }

      //No template found at all!
      return false;
   }


   /**
    * @param NotificationTarget $target     Target instance
    * @param string             $tid        template computed id
    * @param mixed              $to         Recipient
    * @param array              $user_infos Extra user infos
    * @param array              $options    Options
    *
    * @return array
   **/
   function getDataToSend(NotificationTarget $target, $tid, $to, array $user_infos, array $options) {

      $language   = $user_infos['language'];
      $user_name  = $user_infos['username'];

      $sender     = $target->getSender();
      $replyto    = $target->getReplyTo($options);

      $mailing_options['to']          = $to;
      $mailing_options['toname']      = $user_name;
      $mailing_options['from']        = $sender['email'];
      $mailing_options['fromname']    = $sender['name'];
      $mailing_options['replyto']     = $replyto['email'];
      $mailing_options['replytoname'] = $replyto['name'];
      $mailing_options['messageid']   = $target->getMessageID();

      $template_data    = $this->templates_by_languages[$tid];
      $mailing_options['subject']      = $template_data['subject'];
      $mailing_options['content_html'] = $template_data['content_html'];
      $mailing_options['content_text'] = $template_data['content_text'];
      $mailing_options['items_id']     = $target->obj->getField('id');
      if (isset($target->obj->documents)) {
         $mailing_options['documents'] = $target->obj->documents;
      }

      return $mailing_options;
   }


   function cleanDBonPurge() {

      $this->deleteChildrenAndRelationsFromDb(
         [
            Notification_NotificationTemplate::class,
            NotificationTemplateTranslation::class,
         ]
      );

      // QueuedNotification does not extends CommonDBConnexity
      $queued = new QueuedNotification();
      $queued->deleteByCriteria(['notificationtemplates_id' => $this->fields['id']]);
   }

}
